Installation guide

ELECTRICALSHOCKHAZARD
Failure to follow this warning could result in personal
injury or death.
The unit cabinet must have an uninterrupted or
unbroken ground to minimize personal injury if an
electrical fault should occur. The ground may consist
of electrical wire or metal conduit when installed in
accordance with existing electrical codes.
Install Electrical Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
Check OAT Thermistor and OCT Thermistor
Attachments
Outdoor Air Temperature (OAT) Thermistor is factory installed by
inserting the nibs on either sides of the thermistor body through a
keyhole in the bottom shelf of the control box and locking it in
place by turning it 90 degrees, such that the spherical end of a nib
faces the front of the control box.
Check to make sure the OAT is locked in place. See Fig. 7.
Connect Ground and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig.6.
Figure 6 J
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
FIELD POWER I
WIRING
FIELD GROUND
WIRING I
Line Power Connections
CONTACTOR
@°@
®
GROUND
LUG
Connect Control Wiring
This unit is capable of communication with an Observer Wall
Control, or will operate using standard 24v 2-stage thermostat.
Route 24v control wires through control wiring grommet and
connect leads to control board. When an Observer Wall Control is
available, connect DX+ and DX- connections only. If additional
grounding is needed connect to C terminal. If a 2-stage
thermostat is used, connect to the C, Y1, and Y2 connections.
Refer to the wiring label for further clarification.
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft. (30.48 m) from unit, as
measured along the control voltage wires, use No. 16 AWG
color-coded, insulated wire to avoid excessive voltage drop.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accessory
transformer for control power, 24-v/40-va minimum.
NOTE: Use of available 24-v accessories may exceed the
minimum 40-va power requirement. Determine total transformer
load and increase the transformer capacity or split the load with
an accessory transformer as required.
Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections to
ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to heater
a minimum of 24 hr before starting unit if ambient is less than
65°F (18°C). To furnish power to heater only, set thermostat to
OFF and close electrical disconnect to outdoor unit.
A crankcase heater is required if refrigerant tubing is longer than
80 ft. (24.38 m). Refer to the Long Line Applications Guidelines.
I
Figure 7 J Outdoor Air Thermistor (OAT) Attachment
OATThermistormust be locked
in place with spherical nib end facing
towardsthe front of the control box.
The Outdoor Coil Temperature (OCT) Thermistor is factory
installed on the liquid tube between the coil assembly and the
liquid service valve. See Fig. 8.
Check to make sure the thermistor is securely attached on the
liquid tube with the clip as shown in Fig. 8.
Figure 8 J Outdoor Coil Thermistor (OCT) Attachment
OCT Thermistor must be
secured tight on the liquid tube.
Airflow Setup with Observer Communicating Furnace
or Fan Coil
When using an Observer Communicating Wall Control and
communicating indoor equipment, airflow is automatically
selected based on equipment size. See Observer Wall Control
Installation Instructions and indoor specification sheet for
available adjustments.
Airflow Setup with Non-Communicating Furnace or
Fan Coil
Two-stage compressor operation requires two different indoor
airflow settings for proper operation. This outdoor unit is designed
for use only with an indoor blower that can be configured for
separate low-stage and high-stage airflow (CFM) levels. Refer to
Specifications subject to change without notice. 421 01 1702 04